Piper J3 Cub 40

Piper J3 Cub 40 Almost-Ready-to-Fly
INSTRUCTION MANUAL Specifications Wingspan: 70.6 in (1795mm) Length: 45in (1145mm) Wing Area: 682sq in (44 sq dm) Flying Weight: 5.3 ‐ 6.0lb (2400 ‐ 2700g) Features  Excellent scale details and classic trim scheme  Easy fuselage access with top fuselage hatch  Light‐weight balsa and plywood contruction  Complete hardware included http://www.valuehobby.com/
Dear Customer, Congratulations on your purchase of piper J3 Cub 40 ARF from Value Hobby. We thank you for your generous support, and hope you enjoy your new airplane. At Value Hobby, we hope to offer competitive prices, good performance, and products that you can setup and use with ease. That’s why we extensively researched and tested this airplane, and suggested all the products necessary for you to setup properly. We understand that you have many choices when purchasing, and we are grateful you choose to buy from us. As vendors, one of the most gratifying things for us is to hear from our customers. We would welcome any suggestion to help us improve. Please make us aware of any errors and imperfections in the airplane or the instructions, or about the setup that we suggested. We hope you’ll find our setup suggestions to be helpful, and enjoy flying your new airplane. Please feel free to contact us at (630) 948‐0947 or email us at support@valuehobby.com Disclaimer By purchasing and/or building this model, user assumes ALL liability and risk involved with this product. This model should be built and flown by an experienced pilot and only flown at AMA sanctioned sites. Value Hobby guarantees this model to be free of defects in materials and workmanship at the date of purchase. This warranty does not cover any parts damaged by use or modifications. In no way shall Value Hobby’s liability exceed the original cost of the purchased model. Further, Value Hobby reserves the right to modify this warranty without notice. Value Hobby has no control over the final stages of assembly or the material used for the final assembly. No liability shall be assumed nor materials used for the final user‐assembled product. By the act of using the final product the user accepts all resulting liability. Value Hobby, as a R/C product vendor, provides a top quality airplane and instructions to complete the model. The quality and flight characteristics of the finished model depend greatly on how it is built; we cannot guarantee the performance for the completed model and representations are expressed or implied as to the performance of the completed model. If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is advised to return this kit immediately, in new and unused condition. Safety in Assembly During assembly of this aircraft, you will be asked to use sharp knives and hobby adhesives. Please follow all safety procedures recommended by the manufacturers of the products you use, and always follow these important guidelines: ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power tools. Safety glasses are the best way to protect your eyes. ALWAYS protect your body, especially your hands and fingers when using adhesives, knives, or tools, especially power tools. Do not cut toward exposed skin with hobby knives. Do not place hobby knives on tables or benches where they can roll off or be knocked off. ALWAYS have a first‐aid kit handy when working with adhesives, knives, or tools, especially power tools. ALWAYS keep hobby equipment and supplies out of the reach of children. 2
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Safety in Flying This is NOT a toy! It is a very high‐performance RC airplane capable of high speeds and extreme maneuvers. It should only be operated by a competent pilot in a safe area with proper supervision. ONLY fly your aircraft in a safe, open area, away from spectators and vehicles–and where it is legal to fly. NEVER fly over an unsafe area, such as a road or street. Never fly too close to yourself or spectators. Never run your motor inside a house or building with the propeller attached – Remove the prop for safety. Required Items CA Glue – Thin and Thick Epoxy glue Hobby Knife Small Phillips Screwdriver Set Metric Allen Wrenches Scissors Small Pliers Wire Cutters Masking tape Optional – Heat gun Before Starting Assembly Examination Unpack your airplane and examine the components. Check for damage of any kind. If you see any damage, please contact Value Hobby immediately. Covering Your airplane was packed in plastic at the factory without any wrinkles in the covering. You may notice some wrinkles now; more likely, you will notice a few in a day or two or the first time you take the plane out to the flying field. These wrinkles are the result of wood shrinkage and/or expansion. Balsa wood changes size and shape slightly as it is exposed to varying humidity in the air. This is a natural property of balsa wood. As your airplane adjusts to the weather in your part of the world, wrinkles may appear and disappear. Wrinkles may be removed with the gentle application of heat to the covering material on your airplane. The best tool to use is a hobby heat gun. Apply the heat gently: the covering material will shrink as you apply the heat, and this will remove the wrinkles. BE CAREFUL! Too much heat applied too quickly can damage the covering, either by causing it to pull away from the wood at seams and corners or even by melting it. The covering will shrink at low temperature with patient application of heat. Wrinkles in the covering DO NOT affect flight performance. Remove the canopy before attempting to use heat on your covering! The canopy is made of thermo‐activated plastic and WILL deform with the application of heat. Do not apply heat to the canopy. If you need to clean your airplane, we recommend using a damp towel. The paint used on the canopy and cowl is not safe for all cleaners. In particular, DO NOT use alcohol on these parts, it will remove the paint. 3
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Recommended Setup Configuration Radio Motor Size Speed Control Recommended Battery（LiPO） Prop Size Servos Y‐Harness Extension Charger Model Qty GForce G32 Brushless Outrunner Motor（4250‐800KV) 80A Brushless ESC 1 1 1 GForce 30C 4000mAh 4S14.8V LiPO 1 14 X 7 or 15 X 6 1 Standard servos 5 (nitro) 4 (electric) 4 channel Universal Servo Y‐Harness （300mm）11.8‐Inch (Futaba "J" and JR Compatible) Universal Servo Extension （600mm）23.6‐Inch (Futaba "J" and JR Compatible) GT POWER X‐CHARGER C6 6S LiPO Charger 1 2 1 Main Parts of the Airplane Accessories and small parts not pictured 4
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Section 1: Aileron Installation Step1. Locate the aileron hinges from the hardware Section 2: Aileron Servo & Control Horn Installation pack, and insert the hinges in the slots in the trailing Step1. Locate the items shown in the picture below. edge of the wing. (Servos and Y‐Harness sold separately). Step2. Saturate each of the hinges with thin CA. Make sure to glue both the top and bottom. Step2. Remove the covering for the inboard servo in the bottom of the wing as shown. Step3. Use the hinge to put the aileron in position. Use a hobby knife to set the gap between the control Step3. Glue the servo mounting blocks to the servo surface and the wing. Also check that the aileron can hatch. (The location has been marked).
move freely without rubbing at the wing tip. Step4. Flex the aileron up and down several times to break in the aileron hinges. Step5. Repeat steps 1 through 4 to install the remaining aileron. 5
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Step4. Place aileron servo between the mounting blocks and mount the servo to the blocks. (Please center the servo arm electronically before mounting). Step7. Tie the string onto the servo extension. Gently Step5. Use two self‐tapping screws to secure the pull the extension through the wing using the string. blocks wont loose. Untie the string when the servo lead has been pulled through. Use tape to secure the servo lead to the wing to prevent it from falling back into the wing panel.
Step6. Tie a wheel collar onto a piece of string. Drop the wheel collar into the wing from the root and retrieve it from the servo opening. 6
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Section 3: Elevator Installation Step8. Secure the hatch to the wing. Step1. Slide the horizontal stabilizer into the slot in the fuselage, and center the stabilizer in the fuselage. Step9. Connect the clevis to the control horn. Center the control surface and use a pen to mark the Step2. Trace the outline of the fuselage on the pushrod where it crosses the hole of the servo horn as horizontal stabilizer using a felt‐tipped pen. shown. Step3. Remove the covering from the horizontal Step10. Bend the pushrod 90‐degree at the mark, trim stabilizer inside the line drawn in the previous step. the excess wire depending on the length of the wire needed, and use a pushrod connector to secure the pushrod wire to the servo horn.
Step4. Position the stabilizer and elevator on a flat surface as shown, and make sure they are in alignment with each other. Then center the joiner wire on the elevator and mark the elevator. Step11. Repeat steps 1 through 10 to install the remaining servo. 7
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Step8. Use the hinges and joiner wire to place the elevators in position, and flex the elevators 45‐degrees a few times up and down, make sure the elevator can move freely. Then apply thin CA on the hinges. Step5. Carve slots and drill holes for the joiner wire on the locations marked on the leading edge of the elevators. Step9. Carefully check the alignment of the stabilizer to the wing to make sure A=B as shown. Step6. Slide the joiner wire into the slot in the fuselage as shown. Step7. Insert four hinges into the slots in the elevators and saturate each of the hinges with thin CA. Make sure to glue both the top and bottom. Step10. Apply the thin CA on both the top and bottom of the stabilizer to secure the stabilizer onto the fuselage. 8
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Section 5: Rudder and tail wheel Installation Step1. Slide the fin back into the fuselage. Check the alignment of the fin to the stabilizer using a square. The fin must be 90 degrees to the stabilizer when properly aligned. If not, carefully sand the bottom of the fin to provide the clearance to align the fin. Step4. Drill a hole in the rudder for the tail wheel wire. Insert the hinges into the slots in the rudder and test fit the wheel wire into the groove. (Bend the wire 90‐degrees so it can insert the pre‐drilled hole). Step2. Insert the fin into the slot in the fuselage and apply some glue. Make sure the fin is fully secured. You might also use 30‐minute epoxy to secure the fin. Apply the epoxy to both the exposed wood on the fin and the slot in the fuselage. Use care not to get epoxy on the elevator joiner wire. Insert the fin and use tape to hold the fin in position until the epoxy fully cures. Step5. Secure the tail wheel bracket to the fuselage using two＃2x3/8in sheet metal screws. Step3. Locate the tail wheel assembly. Roughen the tail gear wire using medium grit sandpaper where it will enter the rudder. Get them assembled. 9
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Step6. Slide the wheel collar against the tail wheel bracket and tighten the setscrew. Step4. Drill three 3/32in holes through the elevator at the locations marked in the previous step. Section 6: Linkage Installation (Rudder and Elevator Servo) Step1. Locate the items necessary for this section. Step5. Place 2‐3 drops of thin CA into the hole to harden the wood. Repeat this for each of the three holes. Step2. Thread a clevis onto a 6in wire a minimum of 10 turns. Step6. Attach the control horn using three 2‐56x1/2 screws and the control back plate. Step3. Remove the back plate from a control horn using side cutters or a sharp hobby knife. Position the control horn on the elevator so the horn aligns with the hinge line of the elevator. Mark the position for the mounting holes using a felt‐tipped pen. 10
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Step9. Repeat Steps 2 through 8 for the rudder linkage. Step7. Attach the pushrod connector to the hole of the servo arm as shown. Step8. Slide the wire through the outer hole in the elevator servo arm. Secure the wire using a nylon wire keeper. It may be necessary to drill out the hole in the servo arm using a 5/64" drill bit. Section 7: Nitro Motor Installation Step1. Locate the items shown in the picture. Step2. Using four PM4X .7874in SHCS, four M4 fiat washers, four M4 lock washers, and thread locking compound, attach the engine mount rails to the firewall. Leave the screws slightly loose. Test fit your engine between the mount halves. Slide the mount halves against the sides of the engine and finish tightening the mount screws. Note: Use a 1/4" piece of heat shrink tubing on the clevis to keep it from opening during flight. 11
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Step5. Attach a quick connector to the servo arm using quick connector washers and retainers. Center the throttle stick and trim with both the receiver and transmitter on. Install the throttle servo arm in the neutral position. Step3. Position the front of the engine drive washer 4.1338in(105mm) from the front of the engine mounting box. Mark the location of the engine mount Step6. Move the servo to the throttle open position holes onto the mount rails using a Dead Center Hole using the radio system. Manually move the throttle Locator Remove the engine from the mount and use a arm on the carburetor to the open position. Use a Ф4 tap and drill set to create threads in the four 3mm setscrew to secure the throttle pushrod wire. mounting holes. Attach the engine to the mount using four PM420mm SHCS, four Ф4 fiat washers, and four Ф4 lock washers. Step7. Check the movement of the throttle to verify there is no binding at either low or high throttle. If there is, make the necessary adjustment to eliminate any binding. Install the throttle servo arm screw when complete. Step4. Prepare an assembled servo horn arm as shown. 12
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Section 8: Fuel Tank Installation Step1. The fuel tank can be assembled as a two line system consisting of a vent (pressure) line to the muffler and a carburetor line. Filling and emptying of the tank would need to be done through the carburetor line, or an optional fuel fill valve. The tank can also be assembled as a three line system having a Step3. Insert the tank into the fuselage with the vent line, carburetor line, and fill line. If install a fill correct side facing up. The fuel tubing should be line, puncture the top of the stopper above the sealed routed through the hole in the center of the firewall. off fuel tube hole. The fill and carburetor lines should extend out 13mm beyond the stopper and the vent line should be bent upwards and left uncut. With the tubes installed in the stopper, the stopper plates loosely in place with the PM3x25mm screw to hold the assembly together. 12 m m
Section 9: Landing Gear & Wheels Installation Step1. Locate the parts of the main landing gear from the hardware pack. Step2. Fit the stopper assembly into the tank with the vent line pointing toward the top of the tank, but not touching. The fuel tubing and clunks (fuel pickup) on the carburetor and fill lines should almost reach the back of the tank but not touch. The clunks must be able to move freely inside the tank when assembled. Adjust the length of the fuel tubing accordingly. When satisfied, tighten the PM3x25mm screw in the stopper to secure it in place (do not over‐tighten). Mark the side of the tank that must face up when installed in Step2. Install the main wheels on the wheel pants as the plane. We also suggest marking the tubes in the shown below. stopper. 13
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Step4. Install the landing gear legs into the fuselage with the provided 3mm screws as shown below. Section 10 – Electric Motor and ESC Installation Step1. Locate the items for this section. Step2. Install your brushless motor onto the motor mount using the 4 black 3mm allen‐head screws included in your kit. Make sure the motor spins freely. Depending on the size of the shaft collar on your Step3. Repeat steps 2 for the other side of the landing motor, you may need to remove a small amount of gear. wood from the firewall for free rotation. 14
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Step3. Fix carefully the prop and spinner as shown below. Step3. Install the ESC inside the motor box or inside the fuselage, depending on the requirement of balancing the CG. Section 11: Cowling and Spinner Installation Section 12: Windows Installation Step1. Install the cowl and align carefully so that the spinner matches the cowl as desired. Be sure canopy Step1. Locate the front windscreen and side windows. hatch is in place for this step. Use the hobby scissors to trim the side windows from their sheets. Step2. Remove the coverings for side windows. Step2. Use a hobby knife to make small holes through the paper strips into the cowling. This locates the cowl screws accurately so that they will screw into the plywood. Use the 4 small remaining wood screws to mount the cowl. 15
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Step3. Use 4 screws to secure the front windscreen to the fuselage. Step4. Use thin CA to secure the side windows to the fuselage. Step5. The hatch is removable. 16
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Section 13: Wing Installation
Parts Required. Low / Precision Rates (in degrees) and Corresponding Exponential Elevator Low Rate 11/16" (11.5º) Up 9/16" (10º) Down High Rate 1/4" (19.5º) Up 1" (18º) Down Linear measurement (Inches) measured at widest part of elevator (roughly in the center). Aileron Low Rate 3/8" (8º) Up 1/2" (9º) Down High Rate 7/8" (21º) Up 11/16" (22º) Down Linear measurement(inches) measured at root. Rudder 11/2" (28º) Left 11/2" (28º) Right Linear measurement(inches) measured at front of counterbalance. Note: Use the Low Rate for most flying. The High Rate is used specifically for performing spin maneuvers Note: that Futaba and Hitec radios require NEGATIVE exponential, while JR and Spektrum use POSITIVE exponential. Step1. Slide the wing tube into the wing panel. Slide the tube and panel into position on the fuselage. Step2. Secure the wing panel using a M6*25MM nylon bolt. Section 14: Setting CG and Control Throws Range test your radio Recommended CG step1. Before fly, be sure to range check your radio as For the first flights, the recommended Center of manufacturer’s instruction manual of your Gravity location is 84mm behind the leading edge of radio‐system recommends. the wing against the fuselage. Use the battery pack, step2. Double‐check all controls (aileron, elevator, moving it forward or backward, to achieve the correct rudder and throttle) move in the correct direction. balance. step3. Be sure that your LiPO battery is fully charged. 17
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Finally...
Enjoy Your Piper Cub J3 40
Have a nice flight!
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